The word 'however' is not a prepositional phrase. First of all, 'however' is not a phrase because it has just one word. Phrases, such as noun...

What type of word is a however?

What type of word is however? As detailed above, 'however' can be an adverb or a conjunction. Adverb usage: He told me not to do it; however, I did it. Adverb usage: However clear you think you've been, many questions will remain.

What are examples of prepositions?

A preposition is a word or group of words used before a noun, pronoun, or noun phrase to show direction, time, place, location, spatial relationships, or to introduce an object. Some examples of prepositions are words like "in," "at," "on," "of," and "to."